.box-background{
    position: absolute;
    left: 70px;
    top: 80px;
    float: left;
    width:90%;
    height:600px;
    background-image: url("../../images/登录注册/登录注册.jpg");
    /*background-repeat: no-repeat;*/
    /*background-repeat: round;*/
    background-position: -30px -15px;
}